Some examples of seeing measurements

Daytime solar observations

(Seeing measured with a Solar Scintillation Monitor)

1 - Seeing and height above the ground

Country side site: ground covered by green grass, no wind, 310 m altitude.

---

Mountain site: 2930 m altitude, rocky ground, no vegetation, no wind.

Seeing measured simultaneously at 1 m and 1.5 m, statistics over 1 hour period of time

Mesurements: Karine Chevalier

---

2 - Seeing and solar image resolution

a - Example of session with seeing good enough for Ha imaging with the C8 EdgeHD (observation site at 310 m altitude):


Example of associated image:
https://viladrich.astrosurf.com/astro/soleil/wl/2025/2025-10-17-0944-ChrVldr-AR4252-C8-HaDS.jpg


b - Example of session with seeing just good enough for Ha imaging with the Mewlon 250 (observation site at 310 m altitude):


Example of associated image:
https://viladrich.astrosurf.com/astro/soleil/wl/2025/2025-09-07-1104-ChrVldr-AR4211-M250-Ha.jpg


c - Example of session with seeing good enough for Ca K imaging with the 300 mm solar Newtonian telescope (observation site at 2930 m altitude):


Example of associated image:
https://viladrich.astrosurf.com/astro/soleil/wl/2024/2024-08-02-0648-ChrVldr-AR3768-N300-CaK-DS014nm.jpg

Night time lunar observations

(Seeing measured with a DIMM)

With the Moon higher than 55° altitude, the seeing at the zenith should be better than about 0.6 arsec in order to get good green images with the RC500 mm telescope (observation site at 2930 m altitude, morning of October, 28th):

Return to home page